Here you can find the source of combineString(Collection
public static String combineString(Collection<String> vec, String sep)
//package com.java2s; /*//from www .j a va 2 s . c o m * Utilities.java * * Copyright (c) 2009 Jay Lawson <jaylawson39 at yahoo.com>. All rights reserved. * * This file is part of MekHQ. * * MekHQ is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * MekHQ is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with MekHQ. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Collection; public class Main { public static String combineString(Collection<String> vec, String sep) { if ((null == vec) || (null == sep)) { return null; } StringBuilder sb = new StringBuilder(); boolean first = true; for (String part : vec) { if (first) { first = false; } else { sb.append(sep); } sb.append(part); } return sb.toString(); } }